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V. I. JOHNSON AND E. G. THOREEN.

4FNEUMATIC CARPET SWEEPER.

APPLICATION FILED JUNE Io, IQII. NENEwED JUNE 9.1916.

1,303,818. Patented May 13, 1919.

UNITED STATES PATENT OFFICE.

vrc'ron. a'. JonNsoN AND mrc e.. rn'o'nnnN, or woncnsrnn, 'nassncnusnr'rs nssIeNons, BY MnsNn ASSIGNMENTS, 'ro THE 'ronnme'roN comrm, or romefroN, coNNncrIcUr, A conrona'rIoN or MAINE.

' mmm: omar-swarm' Speoieation of Letters Patent.

. Application manne 1o,1911,ser1a1 N.ese,411.' nena-warning s, 1s1a 'serial No. 10am.

Be it known that we, VICTOR J. .loHusoN and Emo G.' THOREEN, citizens of the Umted States, residing at Worcester, inthe county.

of Worcester -and State of Massachusetts, have invented a new and useful Pneumatic Carpet-Sweeper, of which the-following is a s ecification.

e principal objects ofthis invention 'are to provide a construction of pneumatic carpet sweeper inl-a compact form and to increase the speed of operation so as to secure more power without increasing-the size of the pneumatics for thel purpose of assisting this object, also to provide a convenient and compact arrangement -of the pneumatcs land dust-bag; to providej an expeditious manner of removing and replacin the pneumatics; to provide an improve construction of inlet nozzle having an improved arrangement for permitting its use either on prove'ments in details of constructionas in drawin will appear hereinafter.

Reference is to be had' to the accompanyin whichx igure 1 1s a side view of a preferred embodiment of the invention; Fig. 2 is a bottom lan view thereof; Fig. 3 is alongitu inalv sectional view on the line 3-3 of Fig. 2.

Fig. 4 is a rear elevation the backplate removed.

Fig. 5 is a front elevation of a portlon of l the front plate or nozzle;

tired supporting wheels 14 are arranged fixed on a transverse shaft 15. This shaft is'provided with bearings in brackets 1 6 inside -the casing.

In order to'provide the desired compactness', this shaft is provided with a vsprocket wheel 17 which by chain 18 drives a smaller ove the wheels. -.With the cranks of this crank shaftare connected a plurality of` f Patentea'Mayialme.;

links 21 .each extending downwardly from the crank shaft and inwardly'so as to-escape contact with the shaft 15 as-the crank shaft isgrotated. The lower end -of each link is connected with the'movable leaf 22 of. a

- .pneumatic 23. These movable leaves are lo- 'cated atthe extreme bottom'ofthe casing, being pivoted at the front so that when the,v v

pneumatics vvare expanded these leaves are almost parallel' with the floor or supporting surface. Each'pneumatichas an individual v fixed leaf 24 located at an inclination. These fixed leaves have side ledges and are individually held in position by screws 24 so.

that they can be removed very easily. In

this construction it will be Iseen that 'the i movement of the frame over the floor causes a motion of rotation to be transmitted to the so that the pneumatics. 23 can be made soft or hard carpets; and to providev other crankvfrom'the wheels at an increased speed, 75

smaller than usual, and yet on account of their increasedspeed they will afford the .necessary power. At the same time thisarrangement provides for locating the pneumatics atl the bottom ofthe casing where they canbe inspected, removed and repaired 1 simply by turnmg thecasing'over and withother mea'ns for getting access to them out providing any removable top plate or Another feature ofimportance due to thisconstruction isthefact that the compartment 25 locatedfover the pneumatics for containing the dust-bag 261s not at the bottom of the casing, but is at the top so that when the dust-bag is Arenioi'fed it is inconvenient position'as it comes out of the casing and does not tend to fall to the iioor' and deposit dust back on the door. Inv other words it is located where it can be taken out very conv'eniently.- Also by having the bottom slant in the direction shown the bulk of the dust can be deposited near the entrance without'clogging the mouth of the dust bag.' This dust bag is locatedf-on the oor of the chamber 25 and is kept from the ports by means of a screen 27 extending over them. Its mouth is secured to a front plate30 by means of a .removable rectangular frame 81 having thumb nuts 32 for holding it in position.

' The edge of the casing is provided with .a

packing 33 andthe front plate 30 is rovided with a pair of spring bars 34 secure at their inner ends and free' to move at their outer ends lfor engaging in elongated slots 35 1n pivoted catches 36 on the casing. The casingv is also rovided with pins 37 which enter vertical y elongated slots 38 in the front` are not adjustable the height of the front plate from the floor can be regulated easily to suit it for hard or soft carpets. The front plate constitutes in effect the nozzle as it is made hollow andi's provided with. an inlet passage 40 and an outlet passage 41, the latter, of course, openin into the interior of the frame 31. The in et passage has at the end thereof a nozzle plate 42 having a row of perforations 46. These perforations are separated by integral partitions 47 arranged transverse to the length of the nozzle. Thus they form bridges in the plane of the bearing surface of the nozzle serving to hold the carpet down at intervals. With a long slot the air currents sometimes tend to draw portions of a soft or thin carpet into the slot, thus partially choking the nozzle, making the machine work hard, and preventing the most eiective action at such a time. Thesev diiiculties are avoided by our construction, particularly when the perforations are made circular as shown. It is preferred also to arrange a second row of perforations alongside that already described, but alternating therewith so as to register with the integral partitions 47. These are shown smaller than the other perforations, and serve to remove the dust from the portions of the carpet passed over by the partitions.

It is to be observed also that the rear plate 43 is made slidable in ways 44 on the casing and is normally held in position by a light spring or catch 45. This is provided so that the rear of the machine can be inspected and repaired very easily. It does not disfigure the casing in any way.

From what has been said it will be seen that an extremely compact arrangement is secured which will provide all the necessary power, and that the dust bag is conveniently arranged for removal while the pneumatics are conveniently arranged for inspection, repairs, and cleaning.

i While we have illustrated and described a preferred embodiment of the invention, we are aware that many modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. Therefore we do not wish to be limited to all the details of construction herein shown and described, but what we do claim is 1. In a pneumatic carpet sweeper, the comblnation with a casing provided with a dustlcombination with a casing having ba compartment, of. means for exhaustin sai compartment, a plate for closing the en of said compartment and casing, said plate 1 for said pins for receivlng them and y ho ding the nozzle rmly against the casing.

3. In a pneumatic carpet sweeper, the

a dustbag compartment, a front plate for closing the front end of said compartment andv casing, said front plate having a passage therethrough and constituting a nozzle, and provided with opposite spring locking pins, and hinged plates on the casing having openings wider than said pins for receiving them and holding the nozzle or front plate firmly against the front edges of the casing in vertically adjusted4 positions,- whereby the height of the nozzle above the supporting sur ace can be regulated.

4. In a pneumatic carpet sweeper, the combination of a casing with a' removable nozzle, therefor provided with opposite spring locking pins, and hinged plates on the casing having openings for said' pins for receiving. them and holding the nozzle firmly against the casing.

5. In a pneumatic carpet sweeper, the combination with a casing having a dust bag compartment at the top and end thereof, a nozzle communicating with said compartment, pneumatics arranged along the bottom of said compartment and having movable leaves at their lower sides, links connected with said leaves and extending upwardly, a crank shaft located within said casing at the top thereof behind said compartment for operating said links, operating wheels within said casing at the bottom of the rear thereof and immediately below the crank shaft, and speed' multiplying means for rotating said crank `shaft from the wheels.

6. In a pneumatic carpet cleaner, the combination with a casing having a dust bag compartment at the top thereof, of a plurality of pneumatics arranged along the bottom of the casing, each having. an individual leaf lixed immovably to the bottom of the dust bag compartment, and a movable leaf, a nozzle communicating with said compartment, and means' for operating the pneumatics.

7. In a pneumatic carpet cleaner, the

combination with a substantially horizontal said' compartment, and means for operating topped casing having a dust bag compartthe pneumatics.v

ment at the top thereof, said dust bag com- In testimony whereof We have hereunto partment having la slanting bottom, of a set our hands, in the presence of two sub- 5 plurality vof pneumatics arranged along the scribing Witnesses.

bottom of the casing, each having an inv VICTOR J. JOHNSON. dividual inclined leaf fixed immovabl;T to ERIC G. 'II-IOREEN.y the bottom of the dust bag compartment, Witnesses:

and a movable leaf pivoted at the bottom of ALBERT E. FAY,

10 saidl incline, a nozzle communicating with C. FoRR'Es'r WEssoN. 

